EP1814609B1 - Drainage device for the treatment of wounds with application of a vacuum - Google Patents

Abstract

The device (100) has a gas-tight wound coverage element (3) of film-like material that is adhesively attached to the skin surface about the wound area to form a sealed space between the wound and the covering element, at least one drainage hose (4) for insertion into the space for evacuating substances from the space and at least one absorption body (2) arranged in the space to absorb wound secretions. The absorption body has at least one layer (7) of a textile section enriched with super-absorbents enclosed by a liquid transmissive sleeve (6), whereby the absorbed wound secretions remain in the absorption body and hence under the covering element until removal of the absorption body.

Description

• ein gasdichtes, aus folienartigem Material bestehendes Wundabdeckungselement, das im am Körper des Patienten angelegten Zustand an der Hautoberfläche um den Wundbereich herum adhäsiv befestigt ist und einen zwischen der jeweiligen Wunde und dem Wundabdeckungselement verbleibenden, abgedichteten Wundraum bildet,
• wenigstens einen an ein den Unterdruck erzeugendes Mittel, wie Vakuumpumpe, anschließbaren Drainageschlauch, der in den Wundraum etwa parallel zum Wundabdeckungselement liegend einsetzbar ist, über den die im Wundraum befindlichen Stoffe evakuiert werden können,
• und wenigstens einen innerhalb des Wundraumes angeordneten, die Wundsekrete aufsaugenden Absorptionskörper.

The invention relates to a drainage device for wound treatment using negative pressure, comprising:

• a gastight wound-covering element of sheet-like material which is adhesively secured to the surface of the skin around the wound area in the body applied to the patient and forms a sealed wound space remaining between the respective wound and the wound-covering element,
• at least one of a negative pressure generating means, such as a vacuum pump, connectable drainage tube, which is lying in the wound space approximately parallel to the wound covering element, over which the substances located in the wound space can be evacuated,
• and at least one disposed within the wound space, the wound secretions absorbing absorbent body.

A device of the type mentioned is from the DE 195 17 699 known. The known device has a covering film for blanket covering and airtight sealing of the wound, so that below the covering film in the area of the wound, a wound space is created in which a Foam insert and a drawn into this drainage tube are used. With the help of the foam insert the wound secretions should be sucked more evenly over the entire wound surface. In turn, a collecting container with vacuum pump for generating the negative pressure is connected to the drainage tube. If the collection container is filled with wound secretion, the entire device is disposed of. The purpose of the disposable device is to continuously deliver the wound secretions through the drainage tube to the collection container.

The US 55 49 584 shows a device for vacuum therapy, which consists of a wound cover, arranged on a suction tube diaphragm pump and a membrane pump downstream of the bag-like collector. Below the wound cover, a layer of material or a loose bed of liquid-absorbent fibers is arranged, which rests on a perforated layer, which in turn is underlaid by a further, adhesive layer. The fibers are still covered by a liquid permeable, multi-window, upper layer, the windows are each backed by a liquid-permeable material portion as well. The suction tube is connected to a connection piece arranged above the wound cover and has no direct contact with the absorption material located within the wound space. The device thus constructed appears to be complicated and expensive to manufacture.

In DE 29 53 373 C2 Also shown is a device for wound treatment using negative pressure, consisting of a wound covering element, an underlying foam insert and at least one tube communicating with the pores of the foam insert.

In DE 38 50 798 T2 a sterile, rectangular but rigid cassette is shown with a housed therein surgical dressing. The cassette is attached with its lower edge to the skin of the patient. The cassette is open top and bottom to enclose the surgical field on the patient.

In US 50 86 763 A is shown attached to the skin of the patient, also cassette-like wound treatment device shown. An exchangeable wound dressing should be placed on the underside of a hinged lid.

One out AT E33 446 B known bag-type wound treatment and wound drainage device has a lower peripheral edge for adhering to the skin of the patient, a catheter holder, two arranged on a top wall treatment openings with caps and lying on the bottom wall of the bag, the access to the wound enabling opening on. The script merely describes the construction of the bag.

The object of the invention is to design a less expensive device for vacuum therapy of wounds, whose structure is simplified.

• der Absorptionskörper wenigstens eine in eine Hülle eingefasste Lage eines mit superabsorbierenden Partikeln durchsetzten Textilabschnittes ist, wobei die Hülle flüssigkeitsdurchlässig ist und Poren aufweist, deren Größe die der superabsorbierenden Partikeln im Wesentlichen nicht überschreitet,
• der in den Wundraum einzulegende Absorptionskörper ein Anfangsvolumen aufweist, das sich im Laufe des Absorptionsprozesses vergrößert und ein Endvolumen annimmt, so dass die absorbierten Wundsekrete - bedingt durch die Porengröße der Hülle - innerhalb des Absorptionskörpers und damit unterhalb des Wundabdeckungselementes bis zur Entfernung des Absorptionskörpers aus dem Wundraum verbleiben.

This object is achieved by a device of the type mentioned, in the

• the absorbent body is at least one layer of a textile section interspersed with superabsorbent particles, the cover being liquid-permeable and having pores whose size substantially does not exceed that of the superabsorbent particles,
• the absorption body to be introduced into the wound space has an initial volume which increases in the course of the absorption process and assumes a final volume, so that the absorbed wound secretions - due to the pore size of the envelope - within the absorption body and thus below the wound covering element until removal of the absorption body from the Wound space remain.

The wound covering element can be fastened to the patient's body via a flexible connection plate, so-called base plate, on which one or more openings adapted to the wound surface (s) are cut out prior to sticking to the skin. However, it is not excluded to dispense with the base plate when a peripheral adhesive surface is introduced at the edge of the wound covering element, provided that the adhesive substance is health harmless and provided at the wound covering element a corresponding connection point for insertion of the drainage tube. However, preference is given to a commercially available supply bag with a gastight treatment window and drain, whose side wall opposite the wound covering element is glued to the connecting plate at the factory.

It is important that within the supply bag at least one superabsorbent enriched, replaceable absorption body and a drainage tube is arranged, which drainage tube is located on the absorption body.

However, the drainage tube can also lie between two absorption bodies forming a sandwich arrangement which have the same or different suction force. In the sandwich arrangement, one with superabsorbents enriched absorbent body and an additional, not provided with superabsorbent absorbent body, for example, a flat, porous foam body are used. In this case, different possibilities are provided, namely a sandwich arrangement in which the foam body lies between the connection plate and the absorbent body enriched with superabsorbents or between the wound covering element and the absorbent body enriched with superabsorbents.

Through the selection of absorption bodies and their suction power, an optimal wound healing process can be "programmed".

In order to kill the germs, the coated absorbent body and / or the additional, foam-like absorbent body and / or the anti-adhesive film element may be provided with substances containing silver, copper or zinc, for example in nanocrystalline form.

It is also important that the surface of the enriched with superabsorbent particles textile section of the absorption body is substantially smaller than that of the shell, so that the absorbent body in the vicinity of its entire filling capacity in its cross section can approach a circular shape unhindered. The exhaustion of the maximum or almost maximum filling capacity of the absorbent body contributes to the cost reduction of the wound treatment.

The wound covering element may be transparent to at least a portion of its surface to allow the condition of the wound healing process to be observed.

The drainage device may be provided with a liquid-permeable, mucous membrane-friendly protective element, which on a the Wound cover element opposite side of the absorbent body is arranged and the area is approximately equal to the coated absorbent body. The protective element can also be made of soft, open-cell foam or a very loose nonwoven fabric. Finally, the protective element can be a loose bed of fleece or foam pieces located below the absorption body, which can be removed from the wound, for example with tweezers, after the absorption process has ended. In addition, a voluminous structure not only fulfills the mucosal protective function, but also the function of an absorber. The open-cell foam or the nonwoven fabric may have pores several times larger than those of the shell so that the larger particles of wound exudate can be taken up.

The negative pressure in the wound space below the wound covering element can be generated manually or mechanically or electrically with the device adhered to the body of the patient. For example, the simplest manual vacuum generation can be done using a so-called shear gripper vacuum pump or a known hand-compressible rubber ball ("ball pump"). For electrical vacuum generation are different, commercially available vacuum pumps that z. B. with hose and pressure regulator are available.

In a stationary, z. B. postoperative wound treatment, the negative pressure can be generated by connecting the drainage device to an existing, stationary clinical vacuum installation, optionally via a pressure regulator.

The device may be polygonal, oval or circular in plan view of its flat side. She can also be in Top view of their flat side similar to the known supply bags, ie be "bottle-shaped".

The shell of the absorption body consists of a liquid-permeable, mucous membrane-compatible natural or plastic, to which the wound secretions do not or hardly adhere. This allows the transport of liquid wound secretions into the absorbent material. The wound secretions pass through the sheath and are absorbed by the superabsorbent-enriched absorbent material.

It is advantageous to provide on the shell of the absorption body a peripheral projection of casing material so that a painful contact of the relatively hard seam with the wound surface can be limited or even avoided. This is understood as a supernatant, the casing material between a peripheral seam and the outermost circumference of the shell.

The sheath of the absorbent body may be provided with a traction means, so that the spent, swollen absorbent body can be easily pulled out of the wound area.

Both the sheath and the absorbent material lying within the sheath may be provided with an odor-inhibiting and / or neutralizing or masking additive, for example with an activated carbon filter.
Of great advantage is that gas evacuation does not entrain any wound secretion particles. These remain within the envelope of the absorbent body until the entire device is removed from the body of the patient and disposed of or the swollen absorbent body is replaced.

Overall, an apparatus for wound treatment is created using negative pressure, in which the wound secretions are sucked through the fleece of the absorbent body which passes through the superabsorber and remain within the envelope surrounding the absorbent body, without returning from the sheath into the covered wound space.
wherein with increasing absorption, the cross-sectional area of the absorbent body is greatly enlarged, several times and approximates a circular shape, and wherein maintaining the negative pressure using a connectable to the device vacuum pump, ie gas evacuation substantially no wound secretions are entrained. In addition, it is possible to dispense with an additional collecting container.

If an excess of wound secretion is to be removed, it is advisable to connect the drainage tube via a check valve to a collecting container, which in turn is connected upstream of a vacuum pump with pressure gauge. In this case, the exchangeable absorption body serves as a temporary storage for the wound secretions emerging from the wound.

The drainage device according to the invention can also be used with the compression therapy, for example in the treatment of open legs.

Fig. 1

eine Drainagevorrichtung in Draufsicht auf das Wundabdeckungselement;

Figuren 2a bis 2d

die an die Haut des Patienten angeklebte Vorrichtung gemäß der Fig. 1, in einem schematischen Schnitt;

Fig. 3

die Vorrichtung gemäß der Fig. 1, jedoch mit einem Hals, ebenso in Draufsicht auf ihre Flachseite;

Figuren 4a bis 4c

einen Schnitt A-A gemäß der Fig. 3 mit drei unterschiedlichen Sandwichanordnungen zweier Absorptionskörper;

Fig. 5

die Vorrichtung gemäß der Fig. 1 oder 3 in einem schematischen Längsschnitt, angeschlossen an eine tragbare oder eine stationäre Vakuuminstallation;

Fig. 6a

eine weitere Ausführungsform der Drainagevorrichtung, in Draufsicht auf das Wundabdeckungselement;

Fig. 6b

einen Schnitt gemäß der Fig. 6a.

An embodiment of the invention is explained in more detail with reference to the drawing. The figures show:

Fig. 1

a drainage device in plan view of the wound covering element;

FIGS. 2a to 2d

the adhered to the skin of the patient device according to the Fig. 1 in a schematic section;

Fig. 3

the device according to the Fig. 1 but with a neck, also in plan view of its flat side;

FIGS. 4a to 4c

a section AA according to the Fig. 3 with three different sandwich arrangements of two absorption bodies;

Fig. 5

the device according to the Fig. 1 or 3 in a schematic longitudinal section, connected to a portable or a stationary vacuum installation;

Fig. 6a

a further embodiment of the drainage device, in plan view of the wound covering element;

Fig. 6b

a section according to the Fig. 6a ,

In the FIGS. 1 and 2a to 2d a drainage device 100 for wound treatment using negative pressure is shown, consisting of a rectangular, foil-like, transparent wound covering element 3, one of hydrocolloid-like connection plate 10, an intermediate absorption body 2 and a drainage tube 4. On the connection plate 10 is an opening 11 (see. Fig. 2a ) cut the wound size accordingly, so that after sticking to the skin of the patient, a gas-tight wound space 5 in the wound area (see. Fig. 2b ) arises. Reference numeral 25 denotes a peripheral edge of the wound covering element 3, which is adhesively bonded to the connection plate 10.

The sealed wound space 5 is therefore in contact with the wound surface, the wound covering element 3 and the inner edge of the opening 11 limited to the connection plate. This wound space has a variable volume, since the wound covering element 3 is not tense. To the wound room, if it is regarded as a vacuum room, the interior of the drainage tube 4 counts up to a closure element, as in the Fig. 5 schematically shown check valve 17th

The drainage tube 4 is pushed gas-tightly below the wound-covering element via a sleeve piece 22 arranged at the edge of the wound-covering element 3 and rests on the absorbent body 2 without contacting the wound surface.

Furthermore, the connection plate 10 has on its two flat sides in each case a protective film 19, 24, of which the later wound area facing protective film 19 can be peeled off. The other protective film 24 is antiadhesive on its side facing the wound covering element 3.

The absorption body 2 is a layer 7 (cf. Fig. 2a ) of a superabsorbent-enriched textile section 33 which is surrounded by the liquid-permeable cover 6. The sheath 6 has a circumferentially extending overhang 9 on its circumference, wherein the layer 7 is approximately 40% smaller in area than the sheath 11.

In the Figures 3 and 5 is one of the above-described similar drainage device 200 shown, in which the wound covering element 3 is part of a known supply bag 13 with neck 27, the wound covering element 3 opposite side wall 8 (see. Fig. 5 ) is firmly glued to the hydrocolloid-like connection plate 10, wherein an outline 26 of the flat-laid supply bag protrudes beyond the connection plate. in the Inside the supply bag 13 glued to the skin of the patient, the flat absorption body 2 is accommodated. Reference numeral 28 denotes a wound contour 28 with a dashed line.

The Fig. 4a shows the drainage device 200 in section AA according to the Figure 3 , The peculiarity of this embodiment is a sandwich assembly 20 of two absorption bodies 2.1, 2.2, between which the drainage tube 4 is located. The 4b also shows a sandwich arrangement in which an additional, non-superabsorbent absorbent body 32 lies between the wound covering element 3 and the superabsorbent-enriched absorbent body 2. In the Fig. 4c In turn, a sandwich arrangement is shown, in which the additional absorption body 32 is located between the connection plate 10 and the absorbent body 2 enriched with superabsorbents. In both last cases, the drainage tube 4 is between the absorption bodies 2, which differ from each other; 32 arranged. The additional, superabsorber-free absorbent body 32 is in the form of an open-cell foam body.

At the wound covering element 3, a relatively wide, round treatment opening 12 is incorporated, through which the absorption body 2 or the additional absorption body 32 can be inserted into the wound space 5 and removed from the wound space. The treatment opening 12 can be closed gas-tight with a pivot cover 23.

In Fig. 1 sketched in the middle of the pivot cover 23 arranged air passage 34 is shown, with which regulate the negative pressure or can be adjusted so that during the suction process within the wound space to an air passage can occur.

The FIGS. 6a and 6b show a drainage device 300, which substantially the in Fig. 1 is similar. The difference is that the perforated part of the drainage tube 4 lying beneath the wound-covering element 3 is fork-shaped. In this way, a stable pressure distributor 40 has arisen, since the two branches 41.1, 41.2 rest on the absorption body 2 and press during the suction against a stiffened rim 42 of the pivot cover 23.

Another pressure distributor 43 is in the form of a flat, open-cell foam piece 44 (see. Fig. 4c ) in front. The foam piece 44 is hardly compressible, therefore, maintains its thickness, which defines a required distance A between the wound covering element 3 and the absorbent body 2.

In addition, a sterile, airtight package (not shown) is provided for the device.

Function (see Figures 2a to 2d and 5):

A deep wound 29 is made by sticking the drainage device 100 according to the Fig. 1 completely covered on the skin of the patient. Previously, an opening 11 was cut out on the connection plate 10 and then the in the Fig. 2a Protective film 19 shown removed so that an adhesive surface 30 at the bottom of the connection plate 10 releases.

With sterilized tweezers (not shown), the mucosa-friendly, perforated, foil-like protective element 1, then the flat absorption body 2 together with the sheath 6 was first carefully placed on the wound surface through the treatment opening 12. Of the Absorbent body 2 has an initial volume V1. About the sleeve piece 22 of the drainage tube 4 is then pushed under the wound covering element 3 so that it rests on the shell of the absorption body 2 (see. Fig. 2b ). By adhering the drainage device to the skin, a gastight wound space 5 has been created between the wound covering element 3 and the wound surface.

To the drainage tube 4 was via a line 31, a hand-operated vacuum pump 15, which is equipped with a pressure gauge 15 (see. Fig. 5 ), connected. Since the wound space 5 is sealed, the gases located in the wound space 5 can be evacuated with the aid of the vacuum pump 15. The state show the FIGS. 2b and 5 , With the help of the vacuum pump 15, a negative pressure of about 100 ml Hg was generated within the wound space 5. On the line 31, a check valve 17 is arranged between the sleeve piece 22 and the vacuum pump 14, which allows the flow of gases and possibly liquid wound secretions only in the direction of a vacuum pump 16 upstream of the collecting container 16.

The wound secretions emerging from the wound enter the absorption body 2 and cause compression below the wound covering element 3. After suction of wound secretions, the absorption body 2 assumes its final volume V2 (cf. Figures 2c and 2d ). All wound secretions that have just leaked from the wound are absorbed by the absorbent body 2. The outside of the shell 6 remains basically dry.

The spent absorption body 2 and the protective element 1 are now carefully removed by lifting the pivot cover 23 with the help of tweezers from the area of the wound (see. Fig. 2d ). If necessary, a new absorbent body and a new protective element 1 can be placed on the wound.

In very severely secreting wounds can come to excess wound secretions, which are fed via the drainage tube 4 to the collection container 16.

If the patient is to be subjected to a stationary wound treatment, the negative pressure in the wound space 5 in the wound area can be reduced by an existing clinical vacuum installation 21 (FIG. Fig. 5 ) be generated. For this purpose, it is recommended to install on the line between the drainage tube 4 and the vacuum installation 21, a pressure regulator 18, with which the negative pressure range can be adjusted.

LIST OF REFERENCE NUMBERS

1

protection element

2

absorbent body

3

Wound covering element

4

drainage tube

5

wound space

6

shell

7

location

8th

Side wall

9

Got over

10

connecting plate

11

Opening (v. 10)

12

Treatment opening (v. 3)

13

supply bag

14

vacuum pump

15

pressure gauge

16

receptacle

17

check valve

18

pressure regulator

19

protector

20

sandwich

21

Vacuum installation (stationary)

22

sleeve piece

23

hinged cover

24

protector

25

Edge (v. 3)

26

Outline (v. 13)

27

Neck (from 13)

28

wound contour

29

wound

30

adhesive surface

31

management

32

additional absorption body

33

textile section

34

Air passage

40

pressure distributor

41.1

branch

41.2

branch

42

wreath

43

pressure distributor

100

drainage device

200

drainage device

300

drainage device

A

distance

V1; V2

volume

Claims (28)

1. Drainage device (100; 200; 300) for wound healing using negative pressure, comprising:

   - a gas-tight wound covering element (3) consisting of film-like material, which element, having been placed on the body of the patient, is adhesively attached to the skin surface around the region of the wound and forms a sealed wound chamber (5) which remains between the wound in question and the wound covering element (3),

   - at least one drainage tube (4) which can be attached to a means for producing the negative pressure such as a vacuum pump (14), can be inserted into the wound chamber (5) lying approximately in parallel with the wound covering element (3), and by means of which the substances in the wound chamber (5) can be evacuated,

   - and at least one absorption body (2) disposed within the wound chamber (5) and soaking up the wound secretions,
   characterised in that

   - the absorption body (2) is at least one layer (7), enclosed in a sheath (6), of a textile portion (33) interspersed with superabsorbent particles, wherein the sheath (6) is liquid-permeable and has pores, the size of which does not essentially exceed that of the superabsorbent particles,

   - the absorption body (2) to be placed into the wound chamber (5) has a starting volume (V1) which is enlarged over the course of the absorption process and assumes a final volume (V2) so that - dependent upon the pore size of the sheath (11) - the absorbed wound secretions remain within the absorption body (2) and therefore below the wound covering element (3) until the absorption body is removed from the wound chamber.
2. Drainage device as claimed in claim 1, characterised in that in a plan view onto its flat side the layer (7) has a surface which is 3% to 90% smaller that that of the sheath (6) so that the absorption body can, without hindrance, approach a circular cross-sectional shape when close to its entire filling capacity.
3. Drainage device as claimed in claim 1, characterised in that the wound covering element (3) has a window-like operating orifice (12) by means of which the absorption body (2) can be placed into the wound chamber (5) and removed from the wound chamber, wherein the operating orifice (12) can be closed in a gas-tight manner by a cover (23).
4. Drainage device as claimed in any one of claims 1 to 3, characterised in that on the wound covering element (3) or on the cover (23) at least one air aperture (34) is disposed, with which the negative pressure within the wound chamber can be regulated.
5. Drainage device as claimed in claim 1, characterised in that the textile portion of the absorption body consists of cellulose non-woven fabric.
6. Drainage device as claimed in claim 1, characterised in that this device contains a liquid-permeable, mucous membrane-friendly protective element (1) which is disposed on a side of the absorption body (2) opposite the wound covering element (3) and which in terms of its surface is approximately equal to the sheathed absorption body.
7. Device as claimed in claim 6, characterised in that the protective element (1) is film-like.
8. Device as claimed in claim 6, characterised in that the protective element (1) is a textile material portion.
9. Device as claimed in claim 6, characterised in that the protective element (1) consists of foamed material.
10. Device as claimed in claim 6, characterised in that the protective element (1) is a loose bulk material of pieces of non-woven fabric or pieces of foamed material which lies underneath the absorption body (2).
11. Drainage device as claimed in claim 1, characterised in that the wound covering element (3) is transparent on at least part of its surface.
12. Drainage device as claimed in any one of claims 1 to 11, characterised in that the wound covering element (3) can be attached to the body of the patient by means of a flexible attachment plate (10) in which at least one orifice (11) is provided.
13. Drainage device as claimed in any one of claims 1 to 12, characterised in that the wound covering element (3) is part of a supply pouch (13), the side wall (8) of which, opposite the wound covering element, is at least partially stuck to the attachment plate (10).
14. Drainage device as claimed in any one of claims 1 to 13, characterised in that the sheath (6) of the absorption body (2) is stitched by ultrasonic stitching.
15. Drainage device as claimed in any one of the preceding claims, characterised in that on its periphery the absorption body has an overhang (9) of sheath material.
16. Drainage device as claimed in any one of the preceding claims, characterised in that the drainage tube (4) is fed to a receiving container (16), which receiving container is connected upstream of the vacuum pump (14) and/or of a pressure gauge (15).
17. Drainage device as claimed in any one of the preceding claims, characterised in that the vacuum pump (14) is electrically or mechanically driven.
18. Drainage device as claimed in any one of the preceding claims, characterised in that the drainage tube (4) lies between two absorption bodies (2.1, 2.2; 32) which form a sandwich arrangement (20) and have the same or different drawing power.
19. Drainage device as claimed in claim 18, characterised in that the sandwich arrangement (20) has an absorption body (2), which is interspersed with superabsorbent materials, and at least one additional absorption body (32) which is not provided with superabsorbent materials.
20. Drainage device as claimed in claim 14, characterised in that the additional absorption body (32) is a flat open-pored foamed material body.
21. Drainage device as claimed in claims 19 and 20, characterised in that the additional absorption body (32) lies between the attachment plate (10) and the absorption body (2) interspersed with superabsorbent materials.
22. Drainage device as claimed in claims 19 and 20, characterised in that the additional absorption body (32) lies between the wound covering element (3) and the absorption body (2) which is interspersed with superabsorbent materials.
23. Drainage device as claimed in any one of the preceding claims, characterised in that the absorption body (2); the additional foam-like absorption body (32) and/or the protective element (1) comprises silver-containing, copper-containing or zinc-containing substances, for example in nanocrystalline form.
24. Drainage device as claimed in any one of the preceding claims, characterised in that the absorption body (2); the additional foam-like absorption body (32) and/or the protective element (1) is enriched with activated carbon.
25. Device as claimed in any one of the preceding claims, characterised in that below the wound covering element (3), but above the sheathed absorption body (2) or the additional foam-like absorption body (32) a pressure distributor (40) contacting the sheath (11) of the absorption body (2) is disposed.
26. Device as claimed in claim 25, characterised in that the pressure distributor (40) is a moulded part made from gas-tight foamed material.
27. Device as claimed in claim 25, characterised in that the pressure distributor (40) is formed by the drainage tube (4) extending below the wound covering element (3) in a fork-like, loop-like or meandering manner.
28. Device as claimed in any one of the preceding claims, characterised in that this device can be attached to a provided stationary clinical vacuum installation (21) by means of a pressure regulator (18).

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